Abstract: A light-permeable heat-protection element including at least one support element and at least one protective coating containing a reaction product which includes an aqueous alkali silicate solution and aluminate-modified or borate-modified silicon dioxide.

Abstract: A process of preparing a silica sol is described. The process involves reacting a fresh sol with guanidine carbonate. The reaction may be conducted in the presence of a base (e.g., sodium water glass), and at a pH of from 8 to 12. The process of the present invention may also include concentrating steps. The silica sol prepared by the method of the present invention has a BET surface area of greater than or equal to 100 m2/g, and contains from 0.05 to 15% by weight of gaunidinium ions, based on the total weight of the silica gel.

Abstract: A process of preparing a silica sol is described. The process involves reacting a fresh sol with guanidine carbonate. The reaction may be conducted in the presence of a base (e. g. , sodium water glass), and at a pH of from 8 to 12. The process of the present invention may also include concentrating steps. The silica sol prepared by the method of the present invention has a BET surface area of greater than or equal to 100 m2/g, and contains from 0.05 to 15% by weight of gaunidinium ions, based on the total weight of the silica gel.

Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.

Abstract: A light-permeable heat-protection element including at least one support element and at least one protective coating containing a reaction product which includes an aqueous alkali silicate solution and aluminate-modified or borate-modified silicon dioxide.

Abstract: The present invention relates to particles with core-shell structure comprising an acid-functionalized core based on an inorganic material and a shell comprising at least one conductive polythiophene, to dispersions comprising such particles and to the preparation and use thereof.

Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.

Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention.

Abstract: The present invention relates to a process for producing nanosize to microsize particles of compounds of the rare earth metals and other transition metals and also for producing colloid-chemically stable sols of these particles.

Abstract: Methods comprising: (a) providing a silica sol having a BET surface area of 15 to 1000 m2/g and a solids content of up to 45% by weight of silicon dioxide, based on the silica sol; (b) mixing the silica sol and an anionic polyether carboxylate to form a mixture, wherein the anionic polyether carboxylate is mixed with the silica sol in an amount of 0.01 to 10% by weight, based on the mixture; and (c) concentrating the mixture to form a concentrated mixture having a solids content of 20 to 70% by weight of silicon dioxide, based on the concentrated mixture; and the concentrated sols prepared thereby.

Abstract: Use of silica sols containing sulfonic acid groups and/or mercapto groups as nicroparticles in paper production, in particular for paper retention.

Abstract: A process of preparing a silica sol is described. The process involves reacting a fresh sol with guanidine carbonate. The reaction may be conducted in the presence of a base (e.g., sodium water glass), and at a pH of from 8 to 12. The process of the present invention may also include concentrating steps. The silica sol prepared by the method of the present invention has a BET surface area of greater than or equal to 100 m2/g, and contains from 0.05 to 15% by weight of gaunidinium ions, based on the total weight of the silica gel.

Abstract: Provided is a novel high selectivity aqueous slurry composition method of utilizing same. The composition includes non-modified silica based abrasive particles in an amount of about 5 to about 50 weight percent, and an organic compound in an amount of about 0.001 to about 2.0 weight percent in an aqueous solution, wherein the silicon oxide to silicon nitride selectivity ratio ranges from about 50 to about 700.

Abstract: Provided is a novel high selectivity aqueous slurry composition method of utilizing same. The composition includes non-modified silica based abrasive particles in an amount of about 5 to about 50 weight percent, and an organic compound in an amount of about 0.001 to about 2.0 weight percent in an aqueous solution, wherein the silicon oxide to silicon nitride selectivity ratio ranges from about 50 to about 700.

Abstract: A composition for the chemical-mechanical polishing of metal and metal/dielectric structures, containing 7 to 100% by volume of a cationically stablilized silica sol which contains 30% by weight of SiO2 and the SiO2 particles of which have a mean particle size of less than 300 nm, with a pH of from 4 to 10, is distinguished by a TaN removal rate of ?40 nm per min and an improved barrier layer:metal selectivity of at least 2:1 or greater and a barrier layer:dielectric selectivity of at least 2:1 or above.

Abstract: This invention relates to the use of a catalyst for reducing the quantity and/or size of particles in the exhaust gases of a diesel engine by means of a zeolite-containing catalyst having acidic properties.

Abstract: An acidic polishing slurry for chemical-mechanical polishing, containing 0.1 to 5% by weight of a colloidal silica abrasive and 0.5 to 10% by weight of a fluoride salt, is distinguished by a higher polishing selectivity with regard to the rate at which silica is removed compared to the rate at which silicon nitride is removed compared to a conventional polishing slurry containing pyrogenic silica.

Abstract: The invention relates to a process for preparing 4-chlorobiphenyl by (a) reacting biphenyl and chlorine in the presence of one or more ring-chlorination catalysts, and (b) subjecting the reaction mixture obtained in step (a) to fractional distillation to obtain 4-chlorobiphenyl.

Abstract: In the reduction of at least one of the quantity and size of particulates in the exhaust of a diesel engine, wherein said exhaust is contacted with a catalyst, the improvement wherein the catalyst comprises a combination of a zeolite having acidic properties and at least one oxide of a transition metal or rare earth. SO2 in the exhaust gas is not oxidized to sulfates.

Abstract: A composition containing −2.5 to 70% by volume of a 30% by weight cationically modified silica sol, the cationically modified SiO2 particles of which have a mean particle size of 12 to 300 nm, and 0.5 to 22% by weight of at least one oxidizing agent, with pH of 2.5 to 6, is eminently suitable as a polishing slurry for the chemical mechanical polishing of metal and metal/dielectric structures.